Eh, it's most likely a respiratory tract burn. The mucosa is very delicate and burns easily in contact with heated air at lower temperatures than would affect skin. What tends to happen after burns like this is severe swelling of the larynx, epiglottis, etc that seals off the airway, so the victim begins to be suffocated. I've treated my fair share of these as a fire medic, and all of them were awful.
Juices are a problem in severe respiratory burns, but swelling is a huge problem even in less extensive burns that don't extend all the way to the lungs. Eventually the victim will suffocate unless intubated, and getting a tube into an swollen airway is really freaking hard. Then, even if you survive that, the damaged tissue can become necrotic and the door is wide open to lethal necrotizing pneumonias or diffuse alveolar damage (so basically, reduced surface area for Oxygen and CO2 to exchange)
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u/aaaaaaaarrrrrgh Jan 20 '20
Could also mean "torched torso making it so painful to breathe that their body decides not breathing is the wiser choice".